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Tue, 30 May 2023 07:48:50 -0700 From: Avihai Horon To: CC: Alex Williamson , =?utf-8?q?C=C3=A9dric_Le_G?= =?utf-8?q?oater?= , Eduardo Habkost , Marcel Apfelbaum , =?utf-8?q?Philippe_Mathieu-D?= =?utf-8?q?aud=C3=A9?= , Yanan Wang , Juan Quintela , Peter Xu , Leonardo Bras , Eric Blake , Markus Armbruster , Thomas Huth , Laurent Vivier , Paolo Bonzini , Yishai Hadas , Jason Gunthorpe , Maor Gottlieb , Avihai Horon , Kirti Wankhede , Tarun Gupta , Joao Martins Subject: [PATCH v5 5/9] vfio/migration: Refactor vfio_save_block() to return saved data size Date: Tue, 30 May 2023 17:48:17 +0300 Message-ID: <20230530144821.1557-6-avihaih@nvidia.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20230530144821.1557-1-avihaih@nvidia.com> References: <20230530144821.1557-1-avihaih@nvidia.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT042:EE_|DM6PR12MB4314:EE_ X-MS-Office365-Filtering-Correlation-Id: 48838fa7-2e3c-4faa-047f-08db611d01e8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 May 2023 14:49:01.6048 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 48838fa7-2e3c-4faa-047f-08db611d01e8 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.117.160]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT042.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4314 Received-SPF: softfail client-ip=2a01:111:f400:7e8d::631; envelope-from=avihaih@nvidia.com; helo=NAM04-BN8-obe.outbound.protection.outlook.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.167, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Refactor vfio_save_block() to return the size of saved data on success and -errno on error. This will be used in next patch to implement VFIO migration pre-copy support. Signed-off-by: Avihai Horon Reviewed-by: Cédric Le Goater Reviewed-by: Juan Quintela --- hw/vfio/migration.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index 6b58dddb88..235978fd68 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -241,8 +241,8 @@ static int vfio_query_stop_copy_size(VFIODevice *vbasedev, return 0; } -/* Returns 1 if end-of-stream is reached, 0 if more data and -errno if error */ -static int vfio_save_block(QEMUFile *f, VFIOMigration *migration) +/* Returns the size of saved data on success and -errno on error */ +static ssize_t vfio_save_block(QEMUFile *f, VFIOMigration *migration) { ssize_t data_size; @@ -252,7 +252,7 @@ static int vfio_save_block(QEMUFile *f, VFIOMigration *migration) return -errno; } if (data_size == 0) { - return 1; + return 0; } qemu_put_be64(f, VFIO_MIG_FLAG_DEV_DATA_STATE); @@ -262,7 +262,7 @@ static int vfio_save_block(QEMUFile *f, VFIOMigration *migration) trace_vfio_save_block(migration->vbasedev->name, data_size); - return qemu_file_get_error(f); + return qemu_file_get_error(f) ?: data_size; } /* ---------------------------------------------------------------------- */ @@ -335,6 +335,7 @@ static void vfio_state_pending_exact(void *opaque, uint64_t *must_precopy, static int vfio_save_complete_precopy(QEMUFile *f, void *opaque) { VFIODevice *vbasedev = opaque; + ssize_t data_size; int ret; /* We reach here with device state STOP only */ @@ -345,11 +346,11 @@ static int vfio_save_complete_precopy(QEMUFile *f, void *opaque) } do { - ret = vfio_save_block(f, vbasedev->migration); - if (ret < 0) { - return ret; + data_size = vfio_save_block(f, vbasedev->migration); + if (data_size < 0) { + return data_size; } - } while (!ret); + } while (data_size); qemu_put_be64(f, VFIO_MIG_FLAG_END_OF_STATE); ret = qemu_file_get_error(f);